The TK-863 is a trunking radio with a weird scan. You cannot make it a conventional only radio like you can a TK-880 (which makes scanning a little more intuitive).
The desk mic will provide hook ground and scan unless you have the monitor button locked down. Off hook scan is in the scan information tab. Check the box and the scan will proceed regardless of the hook line.
You will want to use list type scan. Fixed system scan doesn't allow operator changes.
Where your problem lies, I believe, is you need to go to each channel (group) under group data and uncheck "group lock out". It is enabled by default.
All groups not locked out will now scan. However, you cannot select groups by a button to add/delete them from scanning. You will have to reprogram the radio using the "group lock out" check box to select what you scan.
If all you have is GMRS, you can create a bunch of conventional systems each with a single group (channel) in it. Now you can use the D/A button to select your scan list as it only works to add/delete systems (again making sure group lock is unchecked). Also make sure your up/down buttons are for system up/down, not group up/down.
I told you this was screwy.
